Move setup.py/pip cmake-out to repo_root/cmake-out #7720
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Our setup.py/pip runs currently do CMake builds under the setup.py build_temp directory, which results in the build directory pip-out/temp.something/cmake-out. This does not share built artifacts with any of the other things that might do a CMake build, such as CI scripts, developers focused on C++, or users following the directions for an example or backend. I am not aware of any particular cost to just using the same cmake-out directory as everything else (please chime in if you are aware!) and there's a clear benefit, so let's try this?